GRID FROM PAGE 28 2000, and scientists saw the potential nals or of simulated data; [or] physics
“[CERN] didn’t want proprietary for reusing the ring for that machine analysis, where the outcome of many
features. They have a lot of different for an even more powerful one. positions are sampled in a statistical
[networking] firms involved,” added While scientists using telescopes way,” said CERN’s Meinhard.
Bugnon. can perceive 3 percent of what the The middleware also implements
Once the experi- authentication and
ments begin, 7,000 authorizationtoensure
scientists will ana- that research institu-
lyze subsets of the tions supporting the
data, looking for grid have appropriate
proof of the elu- access and that “others
sive Higgs boson are not getting a free
par ticl e or theo- ride,” Grey said.
retical supersym- The grid middle-
m e t r i c p a r t i c l e s ware, which represents
not yet proved. The more than 1 million
Higgs boson parti- lines of code created
cle has never been usingtheopen-source
seen, but scientists Globus Toolkit, also
believe that if it performs accounting
can be identified, it functions to “make
could help explain sure nobody’s hog-
why an electron has ging the grid,” Grey
a negative charge said. “It also imple-
and a proton has a Workers at CERN move part of a particle detector into the experiment’s cavern. ments security and
positive charge. monitoring to ensure
Scientists will start the experiments universe is made up of, the other 97 the grid is available 24/7.
in November by circulating the first percent remains a mystery. “There “It is a big engineering effort to
beams of protons at low energy levels are many candidates for what dark make sure the middleware is stable
in test runs. The first particle collisions matter could be—one could be super- and runs well when the real data
at high energy are scheduled to begin symmetric particles. The hope is to comes out later this year,” Grey said.
in mid-2008, according to CERN. Scien- find them,” Grey said. “It’s fairly “It’s being continuously improved and
tists began thinking of a machine like esoteric, but it’s also pretty funda- re-engineered and hardened to make
the LHC in the early 1980s, according to mental. It’ s about understanding sure it is [up-to-date].”
the organization. CERN ran the Large the universe.” To date, as the accelerator is being
Electron Positron Collider from 1989 to The glue that holds the project completed, CERN and its partners are
together and makes the data capture running simulations across the grid,
The Large Hadron andanalysis possible is thegrid middle- shifting “gigabytes of files and large ware, “a layer of software that allows amounts of data” to test its mettle,
Collider you to do your analysis without hav- Grey said.
ing to worry where the data is or the CERN is also leading the charge to
computing power on the grid.” create a European multiscience grid
The middleware, which optimizes that will support a range of scientists
use of the grid, includes such elements and experiments.
as resource brokers that determine at “The long-term vision with these
any given point in time which data grids is like the Web,” Grey said. “At
centers have the necessary capacity some point, they link up and standards
for a task submitted by an authorized develop, so that, as a scientist, you just
physicist and determines where the submit [computing tasks] to the grid
task will be handled. and don’t ask which one [will complete
The types of jobs that the middle- it]. But we’re quite a ways from this.”
ware, developed in-house, will distrib- Once the experiments start in
ute across the processors fall into three November, the project will gather data
categories. “It is either simulation of for 15 years, although the data could be
Source: CERN physics interaction in the detector; studied for many years after the LHC
reconstruction of real detector sig- shuts down. ´
CERN’s massive particle accelerator:
Brings protons and ions into head-
on collisions; first collisions sched-
uled for mid-2008
Sends the particles around the
LHC ring at 99.999999 percent the
speed of light
Sends beams of protons and ions
guided by magnets around the ring
inside a continuous vacuum
Is designed to re-create conditions
in the universe fractions of a second
after the big bang
